Shaping method of needled carbon / carbon-copper composite material felt body

Abstract

The invention relates to a shaping method of a needled carbon / carbon-copper composite material felt body, and belongs to the field of materials for electric locomotives. Based on the problem that in the industrial production process, uncontrollable deformation of a large-size carbon fiber-copper felt body woven with a copper wire mesh is very easy to occur in the subsequent processing process, the invention provides a special process of firstly dipping and curing and then carbonizing to obtain a product with excellent shape for the first time. In the exploration process, it is found that when the prefabricated felt body is a flat woven felt body before being put into the box, by adopting the technology, in the product, the deviation angle of the woven carbon fibers and copper wires is small, and the deviation number is small. The process is simple and controllable, and industrial application is facilitated.

Description

Technical Field

[0001] The invention relates to a shaping method for a needle-punched carbon / carbon-copper composite material felt body, and belongs to the field of materials for electric locomotives. Background Art

[0002] The sliding bar is bonded with aluminum alloy to form a carbon slide plate. The sliding bar slides with the high-voltage contact line, and the power is transmitted from the contact network to the locomotive to achieve the function of conducting current. As electric locomotives develop towards high speed, the sliding bar is subjected to greater and greater impact from the contact network during the sliding process. Therefore, an excellent sliding bar should have both low resistivity and good impact resistance.

[0003] Carbon / carbon-copper composite materials use carbon fiber as reinforcement, and their impact toughness is doubled compared to existing metal-impregnated carbon. They are not prone to edge collapse and block falling, and their wear resistance is better than that of metal-impregnated carbon. They are internationally recognized as a new generation of carbon skateboard materials. The existing preparation process of carbon / carbon-copper composite materials includes first weaving carbon fiber and copper mesh into a preform of a certain density, and then densifying by chemical vapor deposition and resin impregnation-carbonization to finally form a carbon / carbon-copper composite material. One problem with this process is that the felt body formed by weaving is relatively soft, and because a continuous copper mesh is woven in, it is very easy to deform during the subsequent impregnation and / or vapor deposition process, making it difficult to control the accuracy of the product. Therefore, in the prior art, chemical vapor deposition is generally used to shape it, which has high production costs, and this shaping requires a large amount of graphite tooling, and the utilization rate of the charging space in the furnace is low. To this end, it is necessary to develop a shaping method for woven carbon fiber and copper mesh preforms to improve the space utilization rate of equipment and reduce production costs. Summary of the invention

[0004] The present invention is based on the problem that large-sized carbon fiber-copper felt woven with copper mesh is very easy to deform uncontrollably during subsequent processing during industrial production. For the first time, a special impregnation-curing process combined with carbonization is proposed to obtain an excellent product with a fixed shape. During the exploration process, it was found that when the prefabricated felt is placed in the box, it is a flat woven felt. Using the process of the present invention, the deviation angle of the woven carbon fiber and copper wire in the product is small, and the deviation amount is also small.

[0005] The technical problem to be solved by the present invention is to propose a simple and low-cost manufacturing method for the shaping mode of woven carbon fiber and copper mesh preforms.

[0006] The present invention adjusts the process. After the prefabricated felt body containing the copper mesh is woven, a special impregnation process is selected to shape it and introduce a thermal decomposition carbon source. The specific operation is as follows: The present invention provides a method for shaping a needle-punched carbon / carbon-copper composite material felt, comprising the following steps: Step 1 The carbon fiber non-weft cloth and the carbon fiber mesh tire are sequentially stacked in a cycle according to the following steps: 0° non-weft carbon cloth, copper mesh, mesh tire, 90° non-weft carbon cloth, copper mesh mesh tire, and 0° non-weft carbon cloth; a carbon fiber bundle is introduced perpendicular to the layering direction by a relay needle punching method to prepare a needle-punched preformed felt containing a copper mesh; Step 2 The needle-punched preformed felt containing the copper mesh is placed in a box C with holes on the sides and the bottom for use; the top cover of the box C can move up and down along the height direction of the box, and the area of ​​the top cover is larger than 2 / 3 of the area of ​​the bottom of the box; the top cover also has through holes; preferably, the hole on the top cover of the box C is a conical hole, with the small hole facing outward and the large hole facing inward; the aperture of the large hole is A, the value of A is 0.5~1.5cm, and the aperture of the small hole is 0.5~0.75A. The distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm; The holes on the bottom and side walls of box C are conical holes, with the small hole facing inward and the large hole facing outward; the diameter of the large hole is A, with the value of A being 0.5~1.5cm, and the diameter of the small hole is 0.5~0.75A; the distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm; Step 3 Add curing agent to liquid furan resin and fully preheat at 50-70°C; immerse box C containing needle-punched preformed felt containing copper mesh in the furan resin solution, pull and press back the top cover along the height direction of the box at least 3 times; and in the operation of pressing back the top cover, at least once contact with the needle-punched preform containing copper mesh (only contact cannot generate external pressure on the preform); then take out the box containing the needle-punched preform containing copper mesh and place it until no resin flows out; Step 4 Put the stainless steel box in step 3 into an oven at 160-200°C for 90-150 minutes, and take it out after the resin is cured; and obtain a prefabricated felt containing resin and copper mesh; Step 5 The prefabricated felt containing the resin and the copper mesh obtained in step 4 is placed in a box C with holes on the sides and the bottom, and steps 3 and 4 are repeated to obtain a prefabricated felt containing the resin and the copper mesh that is twice impregnated and cured; Step 6 The prefabricated felt containing resin and copper mesh obtained by secondary impregnation and curing in step 5 is placed in a carbonization furnace and heated to above 800° C. for carbonization treatment to obtain a shaped needle-punched carbon / carbon-copper felt body.

[0007] Preferably, the box is made of stainless steel.

[0008] Preferably, the hole on the top cover of the box is a conical hole, with the small hole facing outward and the large hole facing inward; the diameter of the large hole is A, and the value of A is 0.9-1.2 cm, and the diameter of the small hole is 0.5-0.55 A. The distance from the edge of any large hole inside to the adjacent large hole is less than 0.3 cm.

[0009] Preferably, the hole at the bottom of the box is a conical hole, with the small hole facing inward and the large hole facing outward; the diameter of the large hole is A, with a value of A of 0.9-1.2 cm, and the diameter of the small hole is 0.5-0.55 A. The distance from the edge of any large hole inside to the adjacent large hole is less than 0.3 cm.

[0010] The contact area between the pressing down or pulling up rod connected to the top cover of box C and the top cover of box C is greater than or equal to 0.3 times the area of ​​the top cover of box C and is smaller than the area of ​​the top cover of box C.

[0011] Preferably, the shape of the bottom of the box and the shape of the bottom surface of the prefabricated felt are in a mathematically similar relationship; and the area of ​​the bottom of the box is 1.01 to 1.2 times the area of ​​the bottom of the prefabricated felt; the shape of the top cover of the box and the shape of the bottom surface of the prefabricated felt are in a mathematically similar relationship; and the area of ​​the top cover of the box is 0.99 to 1.005 times the area of ​​the bottom of the prefabricated felt. In the present invention, the use of conical holes, especially the top cover with small holes facing outward and large holes facing inward, and the bottom with small holes facing inward and large holes facing outward, combined with appropriate apertures can ensure that when impregnating the resin, the resin evenly enters the box to evenly impregnate the prefabricated felt body; and it can also ensure that the pressure on the lower surface of the product during the impregnation process is slightly greater than that on the upper surface, so that the probability of product deformation is reduced. The present invention adopts such a process, and as much continuous copper mesh as possible can be woven into it during weaving.

[0012] The length, width and height of the needle-punched preformed felt containing the copper mesh are (1000-1200) mm×(300-400) mm×(40-45) mm. The volume percentage of copper in the needle-punched preformed felt containing the copper mesh is 1-30%. The curing agent is selected from at least one of phosphoric acid, sulfuric acid and nitric acid, preferably phosphoric acid.

[0013] The mass ratio of the liquid furan resin to the curing agent is 1-100:10-150.

[0014] Preferably, the present invention adds a curing agent to the liquid furan resin, fully preheats at 50-70°C, immerses a box containing a needle-punched prefabricated felt containing a copper mesh in the furan resin solution, pulls and presses the top cover back along the height direction of the box 3-5 times, and during the operation of pressing the top cover back, the top cover contacts the needle-punched prefabricated felt containing the copper mesh at least once, then takes out the box containing the needle-punched prefabricated felt containing the copper mesh, and places it until no resin flows out. Such an operation can further make the furan resin and curing agent evenly distributed in the felt body, and can also alleviate the deformation caused by the copper mesh as much as possible.

[0015] As a further preference, the present invention adds a curing agent to the liquid furan resin and fully preheats it at 50-70°C; immerses a box containing the needle-punched preformed felt containing the copper mesh in the furan resin solution for at least 3 minutes, then pulls the top cover along the height direction of the box, continues to immerse for 1-2 minutes, presses the top cover back, and then immerses for another 1-2 minutes after pressing back, repeats the operation of pulling the top cover and pressing the top cover back 2-4 times, takes out the box of the needle-punched preformed felt containing the copper mesh, and leaves it until no resin flows out.

[0016] Preferably, after the impregnation in step 3 is completed, the box of the needle-punched prefabricated felt containing the copper mesh is taken out, and placed with the top surface facing downward until no resin flows out. This operation can further reduce the deformation of the felt.

[0017] In step 4 of the present invention, the oven is first heated to 160-200° C., and then the box with the needle-punched preform containing the copper mesh in step 3 is placed therein and dried to obtain a preformed felt containing resin and copper mesh.

[0018] Preferably, in step five, the preformed felt containing resin and copper mesh obtained in step four is placed in a box C with holes on all sides and at the bottom, with the bottom surface of the preformed felt in step three serving as the top surface of step five and the top surface of the preformed felt in step three serving as the bottom surface of step five. Steps three and four are repeated to obtain the preformed felt containing resin and copper mesh that is secondarily impregnated and cured.

[0019] The shaped felt body obtained by the invention does not require tooling and can be directly placed in a chemical vapor deposition furnace for densification. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a physical picture of the product obtained in Example 1.

[0021] Figure 2 The product obtained in Example 1 is polished on the surface consisting of length and width until the actual copper wire mesh is seen.

[0022] Figure 3 This is a physical picture of the product obtained in Example 2.

[0023] Figure 4 This is a physical picture of the product obtained in Comparative Example 1.

[0024] Figure 5 This is a physical picture of the product obtained in Comparative Example 2.

[0025] Figure 6 This is a physical picture of the product obtained in Comparative Example 3.

[0026] Figure 7 It is a schematic diagram of the structure of the stainless steel box used in the embodiment.

[0027] Figure 8 It is a cross-sectional view of the stainless steel box used in the embodiment.

[0028] The needle-punched prefabricated felt contains more than 70% pores, which are interconnected. When the content of the woven copper mesh is large, it is very easy to cause the felt body to deform during the subsequent construction (including impregnation or vapor deposition). The present invention adopts "the hole on the top cover of box C is a conical hole, the small hole of the conical hole faces outward and the large hole faces inward; the aperture of the large hole is A, the value of A is 0.5-1.5cm, and the aperture of the small hole is 0.5-0.75A. The distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm. The holes on the bottom and side walls of box C are conical holes, the small holes of the conical holes face inward, the large holes face inward, and the small holes of the conical holes face inward. The holes face outward; the diameter of the large hole is A, and the value of A is 0.5~1.5cm, and the diameter of the small hole is 0.5~0.75A. The design of "the distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm" can minimize the deformation of the felt body, especially the large-area felt body, and cooperate with the later operation of "pulling the top cover along the height direction of box C and back-pressing the top cover at least 3 times; and in the operation of back-pressing the top cover, at least once it contacts the needle-punched preform containing the copper mesh but does not generate mechanical pressure" to achieve the redistribution of resin and curing agent and thus improve the probability of uniform distribution of resin and curing agent. Finally, the inverted method is used for curing, which further reduces the possibility of product deformation or uneven deformation due to high density of copper. After the first curing, the inverted method is used in combination with box C and a special impregnation method for impregnation and curing, which further reduces the probability of deformation. DETAILED DESCRIPTION

[0029] Example 1: The carbon / carbon-copper composite material slider in this example is mainly prepared by the following steps: (1) First, PAN type T700 (12K) carbon fiber produced by Toray Co., Ltd. of Japan was used to make a non-woven fabric and a mesh tire. The 0° non-woven fabric, copper mesh, mesh tire, 90° non-woven fabric, copper mesh, mesh tire, and 0° non-woven fabric were stacked in a cycle. The carbon fiber and copper wire were introduced perpendicular to the layering direction by a relay needle punching method, and the sample was woven into a density of 1.53 g / cm 3 The volume content of the copper mesh is 18% of the prefabricated felt. The prefabricated felt is a rectangular parallelepiped, and its length, width and height are 1200 mm×400 mm×42 mm. (2) Place the preformed body into a stainless steel box with holes on the sides and bottom (the structure of the stainless steel box is as follows Figure 7 , 8As shown), for standby use. The top cover of the stainless steel box is provided with a conical hole, with the small hole of the conical hole facing outward and the large hole facing inward; the aperture of the large hole is A, the value of A is 1cm, and the aperture of the small hole is 0.5A. The distance from the edge of any large hole inside to the adjacent large hole is 0.15cm. The hole at the bottom of the stainless steel box is also a conical hole, with the small hole of the conical hole facing inward and the large hole facing outward; the aperture of the large hole is A, the value of A is 1cm, and the aperture of the small hole is 0.5A. The distance from the edge of any large hole inside to the adjacent large hole is 0.18cm. The side wall of the box is also provided with a through hole, and the aperture of the through hole is 1cm. The shape of the bottom of the box and the shape of the bottom surface of the prefabricated felt are in a mathematically similar relationship; and the area of ​​the bottom of the box is 1.1 times the area of ​​the bottom of the prefabricated felt; the shape of the top cover of the box and the shape of the bottom surface of the prefabricated felt are in a mathematically similar relationship; and the area of ​​the top cover of the box is 1.0 times the area of ​​the bottom of the prefabricated felt. (3) Add a curing agent (the curing agent is phosphoric acid) to the liquid furan resin and fully preheat it at 60°C. Soak the stainless steel box containing the preform in the furan resin solution, soak the box containing the needle-punched preform felt containing the copper mesh in the furan resin solution for 4 minutes, then pull the top cover upward along the height direction of the box (when the top cover is initially pulled upward, the top cover and the needle-punched preform felt are in contact and have a weak interaction force), continue to soak for 2 minutes, and then press the top cover back (press the top cover back until it contacts the needle-punched preform containing the copper mesh but does not generate mechanical pressure), and then soak for another 2 minutes after pressing back. Repeat the operation of pulling the top cover and pressing the top cover back twice, then take out the box containing the needle-punched preform felt containing the copper mesh, and place the top cover downward (i.e., invert it) until no resin flows out.

[0030] (4) The stainless steel box is placed in an oven at 180°C for 2 hours. After the resin is cured, the box is taken out to obtain a prefabricated felt containing resin and copper mesh.

[0031] (5) placing the prefabricated felt containing the resin and the copper mesh obtained in step (4) into a box C with holes on the sides and the bottom, and repeating steps 3 and 4 (once) to obtain a prefabricated felt containing the resin and the copper mesh that has been twice impregnated and cured; (6) The prefabricated felt containing resin and copper mesh obtained in step (5) and subjected to secondary impregnation and curing is placed in a carbonization furnace and heated to 850° C. for carbonization treatment to obtain a shaped needle-punched carbon / carbon-copper felt body having a measured density of 1.59 g / cm 3 After calculating the cost, the cost of each additional kilogram of carbon is 78 yuan. The resulting product is a rectangular parallelepiped. Figure 1 As shown in the figure, more than 95% of the carbon fibers and copper wires introduced perpendicular to the ply direction are still in a vertical state. The 95% here is a statistical data, and the maximum deviation angle of the remaining offset carbon fibers and copper wires is less than 37°. Figure 2 For the product obtained in Example 1, the carbonaceous material was polished until the actual image of the copper wire mesh was seen.

[0032] Embodiment 2: The carbon / carbon-copper composite material slider in this embodiment is mainly prepared by the following steps: (1) First, PAN type T700 (12K) carbon fiber produced by Toray Co., Ltd. of Japan was used to make a non-woven fabric and a mesh tire. The 0° non-woven fabric, copper mesh, mesh tire, 90° non-woven fabric, copper mesh, mesh tire, and 0° non-woven fabric were stacked in a cycle. The carbon fiber and copper wire were introduced perpendicular to the layering direction by a relay needle punching method, and the sample was woven into a density of 1.18 g / cm 3 The volume content of the copper mesh is 10% of the prefabricated felt. The prefabricated felt is a rectangular parallelepiped, and the length, width and height thereof are 1200 mm× 400 mm×42 mm. (2) Place the preform in a stainless steel box with holes on the sides and the bottom for later use. The top cover of the stainless steel box is provided with a conical hole, with the small hole facing outward and the large hole facing inward; the diameter of the large hole is A, the value of A is 1.5 cm, and the diameter of the small hole is 1 cm. The distance from the edge of any large hole inside to the adjacent large hole is 0.3 cm. The hole at the bottom of the stainless steel box is also a conical hole, with the small hole facing inward and the large hole facing outward; the diameter of the large hole is A, the value of A is 1.5 cm, and the diameter of the small hole is 1 cm. The distance from the edge of any large hole inside to the adjacent large hole is 0.3 cm. The side wall of the box is also provided with a through hole, the diameter of the through hole is 1.5 cm. The shape of the bottom of the box and the shape of the bottom of the preformed felt are mathematically similar; and the area of ​​the bottom of the box is 1.1 times the area of ​​the bottom of the preformed felt; the shape of the top cover of the box and the shape of the bottom of the preformed felt are mathematically similar; and the area of ​​the top cover of the box is 1.0 times the area of ​​the bottom of the preformed felt. (3) Add a curing agent (the curing agent is sulfuric acid) to the liquid furan resin and fully preheat it at 60°C. The stainless steel box containing the preform is immersed in the furan resin solution, and the box containing the needle-punched preform felt containing the copper mesh is immersed in the furan resin solution for 4 minutes, and then the top cover is pulled upward along the height direction of the box (when the top cover is initially pulled upward, the top cover and the needle-punched preform felt are in contact and have a weak interaction force), and the top cover is pressed back for 2 minutes (the top cover is pressed back until it contacts the needle-punched preform containing the copper mesh but does not generate mechanical pressure), and then immersed for another 2 minutes after the back pressure, and the operation of pulling and pressing the top cover is repeated twice, and then the box containing the needle-punched preform felt containing the copper mesh is taken out, and the top cover is placed downward (i.e., inverted) until no resin flows out;.

[0033] (4) The stainless steel box is placed in an oven at 180°C for 2 hours. After the resin is cured, the box is taken out to obtain a prefabricated felt containing resin and copper mesh.

[0034] (5) placing the prefabricated felt containing the resin and the copper mesh obtained in step (4) into a box C with holes on the sides and the bottom, and repeating steps 3 and 4 (once) to obtain a prefabricated felt containing the resin and the copper mesh that has been twice impregnated and cured; (6) The preform obtained in step (5) is placed in a carbonization furnace and heated to 850°C for carbonization treatment to obtain a shaped needle-punched carbon / carbon-copper felt body with a measured density of 1.21 g / cm 3 After calculating the cost, the cost of each additional kilogram of charcoal is 81 yuan.

[0035] The obtained product is a cuboid. Figure 3 As shown: more than 90% of the carbon fibers and copper wires introduced perpendicular to the ply direction are still in a vertical state. The 90% here is a statistical data, and the maximum offset angle of the remaining offset carbon fibers and copper wires is less than 45°:

[0036] Example 3: Other conditions are the same as those in Example 1, except that: (2) Place the preform in a stainless steel box with holes on the sides and the bottom for later use. The top cover of the stainless steel box is provided with a conical hole, with the small hole facing outward and the large hole facing inward; the diameter of the large hole is A, the value of A is 0.5 cm, and the diameter of the small hole is 0.25 cm. The distance from the edge of any large hole inside to the adjacent large hole is 0.25 cm. The hole at the bottom of the stainless steel box is also a conical hole, with the small hole facing inward and the large hole facing outward; the diameter of the large hole is A, the value of A is 0.5 cm, and the diameter of the small hole is 0.25 cm. The distance from the edge of any large hole inside to the adjacent large hole is 0.25 cm. The side wall of the box is also provided with a through hole, the diameter of the through hole is 1.5 cm. The shape of the bottom of the box and the shape of the bottom of the preformed felt are mathematically similar; and the area of ​​the bottom of the box is 1.1 times the area of ​​the bottom of the preformed felt; the shape of the top cover of the box and the shape of the bottom of the preformed felt are mathematically similar; and the area of ​​the top cover of the box is 1.0 times the area of ​​the bottom of the preformed felt. (3) Add a curing agent (the curing agent is nitric acid) to the liquid furan resin and fully preheat it at 60°C. The stainless steel box containing the preform is immersed in the furan resin solution, and the box containing the needle-punched preformed felt containing the copper mesh is immersed in the furan resin solution for 4 minutes, and then the top cover is pulled upward along the height direction of the box (when the top cover is pulled upward, the top cover and the needle-punched preformed felt are in contact and have a weak interaction force), and the top cover is pressed back (the top cover is pressed back until it contacts the needle-punched preform containing the copper mesh but does not generate mechanical pressure), and then immersed for another 2 minutes after the back pressure, and the operation of pulling the top cover and pressing the top cover back is repeated twice, and then the box containing the needle-punched preformed felt containing the copper mesh is taken out, and the top cover is placed downward (i.e., inverted) until no resin flows out. The obtained product is a rectangular parallelepiped, with the length and width at right angles, the length and height at right angles, and the width and height at right angles. There are no obvious pits or wrinkles on the top and bottom surfaces of the product. 98% of the carbon fibers and copper wires introduced perpendicular to the ply direction that can be observed are in a vertical state. The 98% here is statistical data, and the maximum offset angle of the remaining offset carbon fibers and copper wires is less than 30°.

[0037] Comparative Example 1 The other conditions are the same as those in Example 1, except that the copper-containing carbon fiber preformed felt is directly placed in a liquid furan resin containing a curing agent (its component ratio and dosage are the same as those in Example 1) and impregnated for 16 minutes; the resulting product has a certain degree of deformation, and this deviation is not in one direction, and the deviation angle is generally 5 to 60 degrees, and the angle deviation is extremely random. (For example Figure 4 as shown).

[0038] Comparative Example 2 Other conditions are the same as those in Example 1, except that: (2) The preform is placed in a stainless steel box with holes on the sides and bottom for standby use. The diameter of the holes is 1.5 cm. The top cover of the box cannot be moved. The distance between the top cover of the box and the preform is 5 cm. The preform is immersed for 16 minutes. The product has a certain degree of deformation, and this deviation has a certain randomness, but it has been greatly improved compared with comparative example 1, and the deviation is generally 5~45° (such as Figure 5 as shown).

[0039] Comparative Example 3 The other conditions are the same as those in Example 1, except that: (2) the preform is placed in a stainless steel box with holes on all sides and at the bottom for later use. The top cover of the stainless steel box is provided with a conical hole, with the small hole facing outward and the large hole facing inward; the diameter of the large hole is A, the value of A is 2.5 cm, and the diameter of the small hole is 2 cm. The distance from the edge of any large hole inside to the adjacent large hole is 0.5 cm. The hole at the bottom of the stainless steel box is also a conical hole, with the small hole facing inward and the large hole facing outward; the diameter of the large hole is A, the value of A is 2.5 cm, and the diameter of the small hole is 2 cm. The distance from the edge of any large hole inside to the adjacent large hole is 0.5 cm. The side wall of the box is also provided with a through hole, and the diameter of the through hole is 2.5 cm. The obtained product is as follows Figure 6 shown.

Claims

1. A method for shaping a needle-punched carbon / carbon-copper composite material felt, characterized in that: The steps include: Step 1 The carbon fiber non-weft cloth and the carbon fiber mesh tire are sequentially stacked in a cycle according to the following steps: 0° non-weft carbon cloth, copper mesh, mesh tire, 90° non-weft carbon cloth, copper mesh mesh tire, and 0° non-weft carbon cloth; a carbon fiber bundle is introduced perpendicular to the layering direction by a relay needle punching method to prepare a needle-punched preformed felt containing a copper mesh; Step 2 The needle-punched preformed felt containing the copper mesh is placed in a box C with holes on the sides and the bottom for use; the top cover of the box C can move up and down along the height direction of the box, and the area of ​​the top cover is larger than 2 / 3 of the area of ​​the bottom of the box; the top cover also has through holes; preferably, the hole on the top cover of the box C is a conical hole, with the small hole facing outward and the large hole facing inward; the aperture of the large hole is A, the value of A is 0.5~1.5cm, and the aperture of the small hole is 0.5~0.75A. The distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm; The holes on the bottom and side walls of box C are conical holes, with the small hole facing inward and the large hole facing outward; the diameter of the large hole is A, with the value of A being 0.5~1.5cm, and the diameter of the small hole is 0.5~0.75A; the distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm; Step 3 Add curing agent to liquid furan resin and fully preheat at 50-70°C; immerse box C containing needle-punched preformed felt containing copper mesh in the furan resin solution, pull and press back the top cover along the height direction of the box at least 3 times; and in the operation of pressing back the top cover, at least once contact with the needle-punched preform containing copper mesh; then take out the box containing the needle-punched preform containing copper mesh and place it until no resin flows out; Step 4 Place the stainless steel box in step 3 in an oven at 160-200°C for 90-150 minutes and take it out after the resin is cured; A prefabricated felt containing resin and copper mesh is obtained; Step 5 The prefabricated felt containing the resin and the copper mesh obtained in step 4 is placed in a box C with holes on the sides and the bottom, and steps 3 and 4 are repeated to obtain a prefabricated felt containing the resin and the copper mesh that is twice impregnated and cured; Step 6 The prefabricated felt containing resin and copper mesh obtained by secondary impregnation and curing in step 5 is placed in a carbonization furnace and heated to above 800° C. for carbonization treatment to obtain a shaped needle-punched carbon / carbon-copper felt body.

2. A method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: The material of the box C is preferably stainless steel.

3. A method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: The hole on the top cover of the box is a conical hole, with the small hole facing outward and the large hole facing inward; the diameter of the large hole is A, the value of A is 0.9~1.2cm, and the diameter of the small hole is 0.5~0.55A; the distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm.

4. A method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: The hole at the bottom of the box is a conical hole, with the small hole facing inward and the large hole facing outward; the diameter of the large hole is A, the value of A is 0.9~1.2cm, and the diameter of the small hole is 0.5~0.55A; the distance from the edge of any large hole inside to the adjacent large hole is less than 0.3cm.

5. The method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: The contact area between the pressing down or pulling up rod connected to the top cover of box C and the top cover of box C is greater than or equal to 0.3 times the area of ​​the top cover of box C and is smaller than the area of ​​the top cover of box C.

6. A method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: The shape of the bottom of the box and the shape of the bottom of the prefabricated felt are mathematically similar; and the area of ​​the bottom of the box is 1.01 to 1.2 times the area of ​​the bottom of the prefabricated felt; The shape of the top cover of the box and the shape of the bottom surface of the preformed felt are in a mathematically similar relationship; and the area of ​​the top cover of the box is 0.99 to 1.005 times the area of ​​the bottom surface of the preformed felt.

7. The method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: The length, width and height of the needle-punched preformed felt containing the copper mesh are (1000-1200) mm×(300-400) mm×(40-45) mm; the volume percentage of copper in the needle-punched preformed felt containing the copper mesh is 1-30%. The curing agent is selected from at least one of phosphoric acid, sulfuric acid and nitric acid, preferably phosphoric acid.

8. The method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: The mass ratio of liquid furan resin to curing agent is 1-10:100-150; Add curing agent to liquid furan resin and fully preheat it at 50-70°C; immerse a box containing the needle-punched prefabricated felt containing copper mesh in the furan resin solution, pull and press the top cover back along the height direction of the box 3-5 times; and in the operation of pressing the top cover back, the top cover contacts the needle-punched prefabricated felt containing copper mesh at least once; then take out the box of the needle-punched prefabricated felt containing copper mesh, and leave it until no resin flows out.

9. A method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: Add curing agent to liquid furan resin and fully preheat at 50-70°C; immerse the box containing the needle-punched prefabricated felt containing copper mesh in the furan resin solution for at least 3 minutes, then pull the top cover along the height direction of the box, continue to immerse for 1-2 minutes, press the top cover back, and immerse again for 1-2 minutes after pressing back, repeat the operation of pulling the top cover and pressing the top cover back 2-4 times, take out the box of the needle-punched prefabricated felt containing copper mesh, and leave it until no resin flows out.

10. The method for shaping a needle-punched carbon / carbon-copper composite material felt according to claim 1, characterized in that: Step 3: After the impregnation is completed, take out the box of the needle-punched prefabricated felt containing the copper mesh, place it with the top surface facing downward until no resin flows out, so that the deformation of the felt can be further reduced; In step 4, the oven is first heated to 160-200° C., and then the box with the needle-punched preform containing the copper mesh in step 3 is placed therein and dried to obtain a preformed felt containing the resin and the copper mesh; In step five, the prefabricated felt containing resin and copper mesh obtained in step four is placed in a box C with holes on all sides and at the bottom, with the bottom surface of the prefabricated felt in step three serving as the top surface of step five and the top surface of the prefabricated felt in step three serving as the bottom surface of step five. Steps three and four are repeated to obtain the prefabricated felt containing resin and copper mesh that has been secondarily impregnated and cured.

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